If you are on a Mac, use GarageBand, this is the best way to do it, and it'll be free.

After you finish creating your song (or chopping down a song you already have) go to the Share menu and then choose Send Ringtone to iTunes. From there, drag it from your iTunes library onto the phone.

If you are on a Mac, use GarageBand, this is the best way to do it, and it'll be free.

After you finish creating your song (or chopping down a song you already have) go to the Share menu and then choose Send Ringtone to iTunes. From there, drag it from your iTunes library onto the phone.

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